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" ... This medical device advisory does not affect the company’s continued sale of its newer QuickFlex µ (micro) or Quartet® LV leads, which are fully insulated using Optim® insulation along the entire length of the lead body. Optim insulation is a hybrid material that combines the biostability and flexibility of high-performance silicone rubber with the strength, tear resistance and abrasion resistance of polyurethane, to provide increased durability and flexibility. There have been no reports or observations of externalized conductors in these newer Optim-insulated leads, out of over 65,000 of these leads sold worldwide since 2008. ... "